Eraser.



M. P. HAYES.

` ERASBR. APPLICATION FILED APR.15, 1912.

"1 O63 443 Patented June 3, 1.913.

a citizen of the United States,

the' borough of Manhattan, county, and State of New' York, have in-v'MCHAEL F. HAYES', 0F NEW YORK, N. Y.

ERSER Specification of Letters Patent.

Patented J une 8, i913.

application mea aprilia 191.2. Serin N6. 690,716.

To all whom it may concern:

Be it lmown that I, MICHAEL F. HAYES,

ventedA certain new 'and useful Improvements in Erasers, of which thelfollowing is a specication.. i A

My improvements relate lto the class of abrasive erasers in which rubberis usually t-he-main-base or vehicle of the composition used forcleaning surfaces, as in the. case of the so called rubber erasersfurnished for the use of stenographers, typewriters and' draftsmen, andfor clerical and analogous purposes.

The objects or the invention are, to render an eraser of this class moreeifective and convenient 1n use to protect it from unnecessarydeterioration or contamination. by

reason o f contact with the hand or ext-raneous substances; and to.provide adequate means for sharpening it, and for cleaning its point bythe removal olsoil or smut 1m-- parted to the .point or edge during use,as

after being employed in the removal of ink or substances which are aptto smudge The invention consists in the construction and arrangementoit' parts herein described feature being the combination with the is a'frontend view or" my improved eraser;

and claimed speciiically, a distinguishing rigid metallic holder orhandle for the eraser rubber of a rigid metallic attrition cap tting,and rotatable on said holder in either direction, and performing thedouble function of a protector for the eraser when the latter is not inactual use'as such, andalso of a cleaner for the rubber after use, ashereinafter :fully set forth. Q In the accompanying drawings, Figure l,

Fig. 2, a central longitudinal sectional elevation taken upon `plane ofline 2-2 Fig. l, Fig. 8, is a side elevation ofthe attrition cap andholder, when'in the position shown in Fig.v 2; Fig. 4, a side elevationof the rubber and holder remo-ved from the attrition cap; Fig. 5, acentral longitudinal'sectiona'l elevation showing a modiication of therubber-holder; Figf, is a section, much enlarged, of the outer end ofthe attrition cap; Fig. 7, a side elevation thereof, showing a`corrugated structure; Fig. 8, a transverse section upon planejof line7-7 Fign.

It is tobe understood that by the term rubber I herein designate anysuitableor t of erasion, residing 1n` 1nV the city,

outer end 1,

well known compound adapted to purposes including the variouscompositions of rubber and other ingredients known in the art. y

The rubber R, consists of a cylindrical stick' or body portion having aconoidal preferably in the form of a paraboloid, as shown in thedrawings, which 1s the best form for practical purposes, altlnough anytapering' configuration circularfin cross section will come Within thespirit and intent of my invention, whichA contemplates in this respectashape that may be attained by the rotation of the attrition cap A, 1neither direction upon the tubular holder H, over which the attrition Theattrition cap A consists of a rigid tube the outer extremity of which isformed with 'a concavity a, having an attritive surface adapted to grind-or abrade the end 7, of the rubber R, when rotated in Contacttherewith. This abrasive surface a', may obviously be formed by manyWell known expediente, as by roughening by mechanical means, but Iprefer to line itwith an abrasive compound which in hardening becomespractically an integral part of the cap. I have found la compositioncontaining comminutcd emery eifective for the purpose, since the amountof material to be removed from the end ff,l ofthe rubber R, in order toclean and sharpen it is comparatively slight under ordinary conditionsof use. In order to secure the perfect adhesion of the abrasive lininginternally, and to aiiord purchase for the fingers of the userexternally, i

the attrition cap A, may be corrugated longitudinally as indicated inFigs. 7 and 8.

The rubber R, is provided with a rigid tubular Vholder o r handle H,fitting snugly over and Contactin with the cylindrical body thereof, anda ordin-g'means whereby the rubber may-be manipulated in use withoutingering .the same directlyy-it being well knownf'that rubbers of thischaracter are more or less absorbent, and deteriorate if contaminated.The body of the rigid i tube of which the attrition cap A, is formed,fits snugly over the rigid tubular holder H, so as to be sustained inperfect alinement.

therewith, while rotatable thereon in either direction. Hence, incleaning the conoidal end r, of the rubber R, the' attrition cap A, orthe holder-H, either or both, may be rotated in either directiom'oralternately in opposite directions, as may be found most ber as thelatter is worn away. Hence, also owing to the perfect alinementmaintained between the parts, the rubber tip if properly cleaned isalways perfectv in configuration and therefore adapted to allrequirements of use.

In the modification shown in Fig.- 5, the holder H, is formed with anouter casing Il., fitting over the inner end of the attrition cap A.Either the attrition cap A, or the holder H, may be provided With anangular iiange f, to prevent the device rolling on a smooth surface.

The elasticity and resilience of the rubs bei' R, admits of itsadjustment within the holder H, to'coiupensate for Wear, &c., and theadjustment of the attrition cap A, on the holder also ,contributes tothe utilization ot practically the whole length ot the rubber R.

The use of the attrition cap A, is obvious. W'hen the rubber R, is not.desired for actual use it is protected by the cap A, against contactwith extraneous objects. To remove any smudge or dirt from the end r, ofthe rubber'lt, the cap A, is pressed slightly against it, and turned ineither direction, thereby abrading the end 7*, and cleaning it with aminimum of Waste, at the same time restoring and perfecting its shape sothat it is in best condition for future use. may be convenientlyaccomplished by alternately reversing the motion after a par' tial turnet' the attrition cap A, or of the holder H, in either direction,` thecomplete l rotation of, either part not being necessary.

To remove the dust from the attrition cap the latter is Withdrawntemporarily from the holder H after the grinding Operation, and tappedgently; or the dust may be dis- This lodged by blowing through 'an axialhole an, formed forv the purpose inthe extremity ot ,the cone. For,convenience of `ident-icationin the claims I have therein designatedthe end r, of the rubber R, as the tip thereof. The conoidal tip. r, ofmy improved ferm of rubber adapts it for use in small areas, and forpurposes of erasure where the Work is close and intricate, Withoutdanger of disturbing or defacing adjacent lines ormarks,

ing or reniarliing Within lprescribed or desired limits, and hencebroadening and enand obviatiug superfluous labor.

What l claim as my invention and desire to secure by Letters Patent is,

comprising a rigid tubular holder, a co- 'noidally tipped eraserforniedwith a cylindrical portion which lits snugly Within said. 'rigid tubularholder, and a rigid attrition cap formed with a cylindrical ortionfitting snugly over, and slidable an rotatable in either direction upon,said rigid-tubular holder, said cap being also formed with an internalyconcave abrasive' surface adapted to contact with the eonoidal' tip 'othe eraser, for the purposeset forth.

Q. An eraser of the character designated, comprising a rigid tubularholder, aconoidally tipped eraser formed with a cylindrical port-ionwhich tits snugly Within said rigid tubular holder, and a longitudinallycorrugated rigid attrition cap fitting snugly over, and' slidable androtatable in either Guo. WM. lilIA'rr.

topies ofthi patent may 'be obtained for five cents each, by addressingthe Commissioner ol'itents. Washington, D. C.

l. An eraser of the character' designated,-

thereby restricting the necessity tor retouchlai-ging the functionalscope of the eraser, 1

direction upon, said rigidltubular holder, said attrition cap being alsoformed with

